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{{Infobox collection|title=In prima parte agitur|author1=[[User:Giovanna Murano|Giovanna Murano]]|century=saec. XII}}

''In prima parte agitur'' (after its incipit: ''In prima parte agitur de iustitia naturali et positiva, tam constituta quam inconstituta'') is an anonymous introduction frequently copied before the text of [[Gratian, Concordia discordantium canonum|Gratian's ''Decretum'']]. It is attested in the earliest witnesses of the work, e.g. in [[Montecassino, Archivio dell’Abbazia, 64]] (siglum '''Mv'''), from the mid-twelfth century, probably made in the same abbey, and from this manuscript it was edited in ''Bibliotheca Casinensis seu Codicum Manuscriptorum'', II (1875) pp. 171-196. It also appears in the mss. [[Admont, Stiftsbibliothek, Cod. 23]] (fol. 1v-8r) and [[Admont, Stiftsbibliothek, Cod. 43|Cod. 43]] (fol. 1v-11r, ''om''. De cons.), witnesses of the first recension, but was no longer copied in the manuscripts producedfrom the first decades of the thirteenth century onwards.

==Manuscripts==
For manuscripts, see [[:Category:Manuscript of In prima parte agitur]].

== Literature ==
{{author|Nordenfalk}}, [https://doi.org/10.2307/1482045 Review of Melnikas] p. 319.

[[Category:Other work]]